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What is important is what perspective you want to portray. Do you want intimate wave lappings on a lake shore? Or do you want large waves of an ocean as if you're standing on the beach? Or do you want distant waves as if you're standing in an alley near the ocean? I think your answer is a tad bit general because there is a vast difference in approach if you want any of those 3 and there are infinite variations of the above.

As an easy way out, you can search for boutique ocean libraries. Tim Prebble over at Hiss and a Roar released a great one with ocean sounds.